Flue-scraper.



j yUnire])cA srirrns PATENT ornrcn.

WILLIAM APPENBRINK, OF QUINCY, ILLINOIS.

FLUE-SCRAPER.

Be it known that I, kWILLrAi/r APPENBRINK,

- a citizen of the United States, resident of Quincy, inthe countyy of Adams and State of Illinois,fhave madera certain new and useful Invention in FlueScrapers, and I declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which itl appertains to maleand use the invention, reference being had tothe accom anying drawings, and to letters or figures ofpreference marked thereon, whichfform a part of this specification.

Figure l is aside view of the invention. Fig. 2 is a central longitudinal section of the same, ythe blades being partly broken away. Fig.r .8 is a detail perspective view of one of the scraper blades.. s Fig. 4L is a section on the line ik- 4, Fig. 2,

The invention relates to flue Scrapers and consists'in the novel construction and combi nations of parts as hereinafter set forth.

In the accompanying drawings illustrating the invention the lettera, designates the central rotary shaft having screw threaded portions yat its forward end, as shown at and c. lScrewed upon the forwardmost threaded portion b, is a hexagonal nut or head d. Any desired number oflateral faces e, may be provided upon this prismatic `head or nut.

f,], represent the spiral ribbon-form springmetal cleaner blades, infnumber corresponding' to the number of lateral faces of the nut d,

. f said blades having plane ou'ter end portions f,f, lying adjacent to the plane lateral faces of the'nut, and terminating in short rightyangle bends f2, f2, lying adjacent to the forn wardend face of the nut. The opposite end portions of the blades are reduced or cut away as shown at f 3. These cleaner orscraper blades are assembled with the end portions f, f', thereof against the lateral faces of the nut d, and the right angle terminations f 2, f 2 thereof against the forward end face of said nut, when the hollow sleeve g, having an in- `ternaldiameter slightly greater than the diameter of the nut d, is slipped over the same and over the forward end portions of the blades, the end wall g of said sleeve forcing the right angle terminations of the blades against the end lface of the nut and securely holding the blades in position, the interval 7L, between the lateral faces of the nut and the inner peripheral surface of the sleeve being at the same time sufficient to allow a Specification of Letters Patent.

Application filed March 2, 1909.

Patented May 25, 1909.

Serial No. 480,994.

limited radial movement of the cleaner blades. The hollow sleeve is loosely engaged with the shaft by means of a perforation g2, in its end wall g, a securing nut i, engaging the threaded portion b, of the shaft, being employed to force the sleeve against the nut and hold the cleaner blades in position.

Each blade f, has a helical turn through one right angle plus the angle subtended by a lateral face e, of the nut d, or ninety degrees lus sixty degrees in the case of a hexagona prism, as is the nut in the present case, making a total turn of each blade of one hundred and fifty degrees, as shown. This turn is accomplished mainly in the first two thirds of the length of the blade from the prismatic head or nut, the last third of the ength of the blade being mainly in a substantially radial or axial plane.

For the purpose of limiting the radial movement of the cleaner blades, a rear head 7c, has screw-threaded engagement with the threaded portion c, of the central shaft and is provided ,with slots Z, at its forward end, arranged, each in an axial plane, radial with respect to the shaft, and perpendicular to the lateral faces of the forward head or nut d, each slot l, being opposite a lateral face c, and receiving a reduced end portion f 3, of a cleaner blade.

This flue cleaner is of simple construction, bein composed of a minimum number of simp e parts, and no auxiliary springs are required therein, as the cleaner blades are themselves formed of ribbon-form strips of spring metal.

In the operation of the invention the forward end portions of the cleaner blades, which are in a substantially radial or axial plane with respect to the central shaft, are in the rotation of such shaft, thrown ra- 'dially outward by centrifugal force against the interior of the fiue to be cleaned. This throw of the blades is limited by the bore of the incrusted flue, such throw becoming greater as the scale is gradually scraped away, and being further and finally limited by the outer end walls of the slots of the rear head 7c. The diameter of the scraper formed by the cleaner blades taken as a whole gradually increases from front to rear.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is* l. A flue cleaner having a central shaft, a

forward prisrnatic head, a rear head having radial slots and helically twisted cleaner blades of ribbon forni, having fiat forward end portions secured to the lateral faces of the prisinatic head, and radially movable rear end portions, having each an axial radial relation with respect to said shaft and engaging a slot of the rear head, said blades having their inain twist in about the first two thirds of their length from their flat forward end portions.

2. A flue cleaner having a central shaft, a forward prisinatic head, a rear head having' radial slots in axial alinernent with the prismatic faces of the forward head, and helically twisted cleaner blades, having each, a twist of one right angle plus the angle subtended b y a lateral face of the prisrnatic head, said blades having flat forward end portions, each in a plane at right angles to the radius of the shaft and secured to a face of the forward head, and radially inovable rear end portions, having each an axial radial relationsK rated from an end wall of the head by an I" interval, and helically twisted cleaner blades having fiat forward end ortions lying adj acent to the lateral faces o the prisinatic head between the saine and said sleeve, and having right angle terminations located in said interval, said blades having radially inovable rear end portions having each an axial radial relation to said shaft and engaging a slot of the rear head.

In testimony whereof I affix iny signature, in presence of two witnesses.

1"JILLIAM APPEN 'Vitnesses GEORGE W. Govnnr, MARY HrGGINs.

KINK. 

